Perry essentially called Swift out after she condemned Minaj for pitting "women against other women" by saying that Swift's "Bad Blood," which is perceived to be about Perry, is capitalizing on pitting women against one another.

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Taylor Swift's 1989 tour

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Taylor Swift threw major left shark shade at Katy Perry

NASHVILLE, TN - SEPTEMBER 26: Singer/songwriters Taylor Swift (L) and Mick Jagger perform onstage during The 1989 World Tour live in Nashville at Bridgestone Arena at Bridgestone Arena on September 26, 2015 in Nashville, Tennessee. (Photo by John Shearer/LP5/Getty Images for TAS)

CHICAGO, IL - JUNE 03: Taylor Swift and Mick Jagger perform at the United Center on June 3, 2013 in Chicago, Illinois. (Photo by Paul Natkin/Getty Images)

SANTA CLARA, CA - AUGUST 15: (L-R) Taylor Swift, musician Joan Beaz and actress Julia Roberts take a bow on stage during Swift's 'The 1989 World Tour' at Levi's Stadium on August 15, 2015 in Santa Clara, California. (Photo by John Medina/LP5/Getty Images for TAS)

LOS ANGELES, CA - AUGUST 24: Singer-songwriter Taylor Swift performs onstage during Taylor Swift The 1989 World Tour Live In Los Angeles at Staples Center on August 24, 2015 in Los Angeles, California. (Photo by Christopher Polk/TAS/Getty Images for TAS)

LOS ANGELES, CA - AUGUST 24: Singer-songwriters Taylor Swift (L) and Natalie Maines of the band Dixie Chicks perform onstage during Taylor Swift The 1989 World Tour Live In Los Angeles at Staples Center on August 24, 2015 in Los Angeles, California. (Photo by Christopher Polk/TAS/Getty Images for TAS)

LOS ANGELES, CA - AUGUST 24: Singer-songwriters Taylor Swift (L) and Natalie Maines of the band Dixie Chicks perform onstage during Taylor Swift The 1989 World Tour Live In Los Angeles at Staples Center on August 24, 2015 in Los Angeles, California. (Photo by Christopher Polk/TAS/Getty Images for TAS)

AMSTERDAM, NETHERLANDS - JUNE 21: Taylor Swift performs in The 1989 World Tour at Ziggo Dome on June 21, 2015 in Amsterdam, The Netherlands. (Photo by Michel Porro/Getty Images for TAS)

PHILADELPHIA, PA - JUNE 13: Taylor Swift performs onstage during The 1989 World Tour on June 13, 2015 at Lincoln Financial Field in Philadelphia, Pennsylvania. (Photo by Dimitrios Kambouris/Getty Images for TAS)

COLOGNE, GERMANY - JUNE 20: Taylor Swift performs live on stage during 'The 1989 World Tour' night 2 at Lanxess Arena on June 20, 2015 in Cologne, Germany. (Photo by Sascha Steinbach/Getty Images for TAS)

COLOGNE, GERMANY - JUNE 20: Taylor Swift performs live on stage during 'The 1989 World Tour' night 2 at Lanxess Arena on June 20, 2015 in Cologne, Germany. (Photo by Sascha Schuermann/Getty Images for TAS)

COLOGNE, GERMANY - JUNE 20: Taylor Swift performs live on stage during 'The 1989 World Tour' night 2 at Lanxess Arena on June 20, 2015 in Cologne, Germany. (Photo by Sascha Schuermann/Getty Images for TAS)

AMSTERDAM, NETHERLANDS - JUNE 21: Taylor Swift performs in The 1989 World Tour at Ziggo Dome on June 21, 2015 in Amsterdam, The Netherlands. (Photo by Michel Porro/Getty Images for TAS)

PHILADELPHIA, PA - JUNE 12: Taylor Swift performs onstage during The 1989 World Tour on June 12, 2015 at Lincoln Financial Field in Philadelphia, Pennsylvania. (Photo by Dimitrios Kambouris/Getty Images for TAS)

BOSSIER CITY, LA - MAY 20: Taylor Swift performs on stage for the 1989 World Tour at CenturyLink Center on May 20, 2015 in Bossier City, Louisiana. (Photo by Christopher Polk/Getty Images for TAS)

PHILADELPHIA, PA - JUNE 13: Taylor Swift performs onstage during The 1989 World Tour on June 13, 2015 at Lincoln Financial Field in Philadelphia, Pennsylvania. (Photo by Dimitrios Kambouris/Getty Images for TAS)

GLASGOW, SCOTLAND - JUNE 23: Taylor Swift performs at The SSE Hydro on June 23, 2015 in Glasgow, Scotland. (Photo by Ross Gilmore/Getty Images for TAS)

PHILADELPHIA, PA - JUNE 12: Taylor Swift performs onstage during The 1989 World Tour on June 12, 2015 at Lincoln Financial Field in Philadelphia, Pennsylvania. (Photo by Dimitrios Kambouris/Getty Images for TAS)

DETROIT, MI - MAY 30: Taylor Swift performs on stage during the 1989 World Tour Live at Ford Field on May 30, 2015 in Detroit, Michigan. (Photo by Larry Busacca/Getty Images for TAS)

COLOGNE, GERMANY - JUNE 19: 'TS' letters are seen during the 'Taylor Swift The 1989 World Tour' night 1 at Lanxess Arena on June 19, 2015 in Cologne, Germany. (Photo by Sascha Steinbach/Getty Images for TAS)

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After Swift and Minaj made up, Swift made no response or even acknowledgement of Perry's tweet. It seemed that perhaps the reigning pop star would simply let Perry's tweet gather dust in the Twitter-verse.

Until last weekend. During her 1989 World Tour concert in Foxborough, MA, Swift brought yet another guest star on stage with her. As Swift performed "Bad Blood" for the crazed crowed, a dancing shark -- identical to the one notorious for his off-beat moves in Perry's Emmy-nominated Super Bowl performance -- appeared behind her.

BOOM! Swift just dished some left shark shade to Perry right where it hurts! The obvious reference did not go unnoticed as Swift turned to face the shark and couldn't help but let out a smirky giggle. When will Katy Perry Learn that there is nothing Swift does better than revenge?